Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Reexamination Certificate
1999-07-19
2001-09-04
Dang, Hoang (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
C175S405100
Reexamination Certificate
active
06283233
ABSTRACT:
The present invention concerns a drill and/or core tool in particular for oil drilling and/or coring, comprising:
a body showing a substantially cylindrical peripheral surface and a front, considered in a movement direction during drilling and/or coring,
blades which extend from the front till over the peripheral surface and which show each a leading edge for the drilling and/or coring,
possibly Polycrystalline Diamond Compacts (PDC) cutting elements which are situated at least in a central area of the front and the longitudinal axes of which are transverse to the rotation axis of the tool, and
nozzles for supplying a drilling liquid.
There is a constant need to increase the efficiency of such tools so that their penetration speeds in the formations to be drilled or cored are the fastest without reducing the life of the tool, i.e. without unnecessarily increasing the weight to which it is subjected to drive it forwards during the operation.
Research is at the same time done to increase an average penetration rate, to increase the time during which a tool can be kept operative in a same drill and/or core hole so as to avoid time wasted for raising the tool up again, controlling, possibly replacing it and for resuming the drilling and/or coring operation.
An object of the present invention is to improve the presently known drilling and/or coring conditions and proposes to this end a tool which provides, on the one hand, a particularly advantageous and economic arrangement of the blades and cutting elements to avoid unnecessarily crushing again of fragments detached from the formation and which provides, on the other hand, a reserve of cutting elements which will practically only be used and acted upon if necessary, for example in case a cutting element, possibly a PDC element, situated on a leading edge is torn away.
To this end, said tool comprises according to the invention moreover, on at least one blade, outside said central area,
PDC cutting elements and/or secondary cutting elements which show each a cutting edge, forming together the leading edge of the blade, and the longitudinal axis of which is transverse to the rotation axis, and
at least one associated cutting element
which is situated, when considering a drilling rotation of the tool, behind at least one of the PDC or secondary cutting elements,
which shows a cross-section of the same shape, at least for its portion protruding from the blade, than that of the PDC or secondary cutting element,
which is disposed on the same blade and
an edge of which destined for cutting is situated at the most on a same radial distance from the rotation axis and at least on a same distance, measured parallel to this rotation axis starting from a plane perpendicular to this axis and situated in front of the tool, than the cutting edge of said PDC or secondary element.
According to an embodiment of the invention, the leading edge of the blades has the shape of a helix with a possibly variable radius and which turns, at least along said peripheral surface, either in the direction opposite to the drilling rotation or in the same direction as it moves away from the front.
According to a particular embodiment of the invention, the width of a blade, taken in a projection plane perpendicular to the rotation axis, increases as one moves away from this rotation axis over the front, and/or from this front in the direction of a back of the tool. It may then be advantageous that the number of cutting elements arranged one behind the other on a same blade and on the same of said distances, radial and parallel to the rotation axis, increases progressively, in particular with one element having preferably a length equal to the length of said cutting elements, as the width of the blade increases.
Other details and particularities of the invention will become apparent from the secondary claims and from the description of the drawings which are annexed to the present specification and which illustrate by way of non-limitative examples various embodiments of the invention.
REFERENCES:
patent: 4471845 (1984-09-01), Jurgens
patent: 4889017 (1989-12-01), Fuller et al.
patent: 4942933 (1990-07-01), Barr et al.
patent: 4981184 (1991-01-01), Knowlton et al.
patent: 4991670 (1991-02-01), Fuller et al.
patent: 5186268 (1993-02-01), Clegg
patent: 5222566 (1993-06-01), Taylor et al.
patent: 5244039 (1993-09-01), Newton, Jr. et al.
patent: 5314033 (1994-05-01), Tibbitts
patent: 5337844 (1994-08-01), Tibbitts
patent: 5505272 (1996-04-01), Clark
patent: 5531281 (1996-07-01), Murdock
patent: 5720357 (1998-02-01), Fuller et al.
patent: 5816346 (1998-10-01), Beaton
patent: 5957227 (1999-09-01), Besson et al.
patent: 1218567 (1960-05-01), None
patent: 2620487 (1989-03-01), None
patent: 2204625A (1988-11-01), None
Desmette Sebastian
Josse Cécile
Lamine Etienne
Browning & Bushman P.C.
Dang Hoang
Dresser Industries, Inc
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